Oil pressure dropped to 10lbs

[Tallpaulboise2]

2013 Denali with 168,000 miles. Changed oil pick up o-ring at 155,000. Have had no oil pressure problems since. This morning the oil pressure wanting came on and I had 10lbs pressure. No oil leaks or low oil. Where is the oil pressure sensor and how do I test it?

 

[j91z28d1]

behind the intake. most pull the intake to get to it. it can be down without it thou.

as for which one.. used to recommend only oem gm from like a dealer or rock auto. never Amazon or ebay. but now days even the oem ones fail. friend of mine went thru 3 in a short time. 2 definitely oem, 1 was Amazon acdelco that was probably fake. he gave up, bought the cheapest at the local auto parts store. he's like if I'm going to have to do the work, may as well be able to return it. the no name hasn't failed on him last I heard.


good luck. hope it's just a sensor.

 

[Fless]

Here's an oldie but goodie from Eric O, who has a few tips on changing and testing. Be sure to replace the screen below the sensor if you have an AFM engine.

 

[Tallpaulboise2]

behind the intake. most pull the intake to get to it. it can be down without it thou.

as for which one.. used to recommend only oem gm from like a dealer or rock auto. never Amazon or ebay. but now days even the oem ones fail. friend of mine went thru 3 in a short time. 2 definitely oem, 1 was Amazon acdelco that was probably fake. he gave up, bought the cheapest at the local auto parts store. he's like if I'm going to have to do the work, may as well be able to return it. the no name hasn't failed on him last I heard.


good luck. hope it's just a sensor.

It haven’t thrower a code so I’m holding off on changing it for now. I would think if the sensor was bad it would show a code.

 

[Tallpaulboise2]

Here's an oldie but goodie from Eric O, who has a few tips on changing and testing. Be sure to replace the screen below the sensor if you have an AFM engine.

 

[Tallpaulboise2]

Its not throwing a code. Should probably just get it towed home and change the sensor. Cheaper than taking it to a shop.

 

[rdezs]

Start by pulling your oil pressure sensor, along with the screen underneath it and see if it's plugged. Then test with the mechanical gauge. If it is in fact low.... Did you replace or plug the oil pressure relief valve in the oil pan while you're changing the o-ring? Those are known to stick. Next problem area is the OEM oil pump itself. Found a bunch of grit in the relief valve on mine. Made the plunger stick.
There's also a port on the driver side of the engine, down near the lip of the oil pan and to the front. Great spot to check the oil pressure coming right off the pump. If pressure there is high, you have an oil filter problem. In that case the bypass in the filter isn't working.... Or an incorrect filter was installed? There's also the o-rings under your VLOM cover.

There's a lot of labor involved in checking those items..... But not as much as pulling the engine to do the camshaft bearings if those are in fact the problem.

 

[Tallpaulboise2]

Start by pulling your oil pressure sensor, along with the screen underneath it and see if it's plugged. Then test with the mechanical gauge. If it is in fact low.... Did you replace or plug the oil pressure relief valve in the oil pan while you're changing the o-ring? Those are known to stick. Next problem area is the OEM oil pump itself. Found a bunch of grit in the relief valve on mine. Made the plunger stick.
There's also a port on the driver side of the engine, down near the lip of the oil pan and to the front. Great spot to check the oil pressure coming right off the pump. If pressure there is high, you have an oil filter problem. In that case the bypass in the filter isn't working.... Or an incorrect filter was installed? There's also the o-rings under your VLOM cover.

There's a lot of labor involved in checking those items..... But not as much as pulling the engine to do the camshaft bearings if those are in fact the problem.

Thanks for these check items. Got my evenings set for this week.